Re: [PATCH v5 05/15] tracepoint: Exclude tp_stub_func from CFI checking

Kees Cook
2021-10-13T19:03:24Z

On Wed, Oct 13, 2021 at 11:16:48AM -0700, Sami Tolvanen wrote:
> If allocate_probes fails, func_remove replaces the old function
> with a pointer to tp_stub_func, which is called using a mismatching
> function pointer that will always trip indirect call checks with
> CONFIG_CFI_CLANG. Use DEFINE_CFI_IMMEDATE_RETURN_STUB to define
> tp_stub_func to allow it to pass CFI checking.
>
> Signed-off-by: Sami Tolvanen <samitolvanen@google.com>

Reviewed-by: Kees Cook <keescook@chromium.org>

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Kees Cook